public class Example23 {
    public static void main(String[] args) {
        int arr[]=new int[4];
        arr[0]=1;
        arr[1]=2;
        System.out.println("arr[0] = "+ arr[0]);
        System.out.println("arr[1] = "+ arr[1]);
        System.out.println("arr[2] = "+ arr[2]);
        System.out.println("数组长度是="+arr.length);
    }
}
